This collection is a sub-subgroup (Board) of the Montana Department of Labor and Industry records, RS 498. The Boiler Operator Program (formerly Boiler Inspector's Office) operates within the Professional and Occupational Licensing Bureau, which falls under the Employment Standards Division of DLI. Please see the primary finding aid for more Montana Department of Labor and Industry records.

Records consist of licensing records for engineers (1891-1921), hoisting engineers (1915-1926), and traction engineers (1905-1928); financial records, including cash books (1893-1932), journals (1893-1897, 1919-1922), a ledger (1893-1896), and receipts (1937-1947); and a register (1891-1893) of licenses issued.